Janus solutions in M-theory

TL;DR

This paper constructs a regular M-theory solution representing a Janus-like interface in a 2+1-dimensional CFT, with a corresponding ABJM reduction, revealing new supersymmetric defect configurations.

Contribution

It introduces a novel one-parameter deformation of AdS4 x S7 in M-theory that models Janus-like interfaces, extending holographic duals to defect theories without a dilaton.

Findings

Regular M-theory solution with SO(2,2) x SO(4) x SO(4) symmetry

ABJM reduction yields a Janus-like defect in ABJM theory

Preserves 16 supersymmetries in M-theory, 12 in ABJM

Abstract

We present a one-parameter deformation of the AdS_{4} x S^{7} vacuum, which is a regular solution in M-theory, invariant under SO(2,2) x SO(4) x SO(4), and which preserves 16 supersymmetries. The solution corresponds to a holographic realization of a Janus-like interface/defect theory, despite the absence of a dilaton in M-theory. The 2+1-dimensional CFT dual results from the maximally symmetric CFT through the insertion of a dimension 2 operator which is localized along a 1+1-dimensional linear interface/defect, thereby partially breaking the superconformal symmetry. The solution admits a regular ABJM reduction to a quotient solution which is invariant under SO(2,2) x SO(4) x U(1)^2, preserves 12 supersymmetries, and provides a Janus-like interface/defect solution in ABJM theory.